[issue41293] fix confusing example in hashlib docs

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

I probably I wrote these docs (a long time ago).  The examples are being used to demonstrate different uses of the APIs including calling update multiple times, different algorithms, a binary digest and a hex digest.  

They weren't mean to show equivalence, but I agree... the wording could be improved to make what they are doing and why more clear.

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<https://bugs.python.org/issue41293>
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